US5918676A - Horizontal tree safety valve - Google Patents
Horizontal tree safety valve Download PDFInfo
- Publication number
- US5918676A US5918676A US08/663,268 US66326896A US5918676A US 5918676 A US5918676 A US 5918676A US 66326896 A US66326896 A US 66326896A US 5918676 A US5918676 A US 5918676A
- Authority
- US
- United States
- Prior art keywords
- valve
- moveable
- ball
- latch
- resiliently biased
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000012530 fluid Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 5
- 239000000969 carrier Substances 0.000 claims description 2
- 230000004044 response Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000007246 mechanism Effects 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
- E21B34/04—Valve arrangements for boreholes or wells in well heads in underwater well heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0406—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded in the form of balls
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/04—Ball valves
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Preventing Unauthorised Actuation Of Valves (AREA)
- Mechanically-Actuated Valves (AREA)
- Catching Or Destruction (AREA)
- Taps Or Cocks (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Earth Drilling (AREA)
- Safety Valves (AREA)
Abstract
A safety valve for use with horizontal subsea trees as described which uses a two-part (10, 12) safety valve system. The first part (10) containing a valve mechanism (16, 18, 22, 26) remains in the wellhead and is normally biased to a closed position. The valve mechanism (16, 18, 22, 26) remains in the wellhead at all times during production and can be actuated to an open position by latching in a second part (12) which contains control cables (58) and a moveable valve actuator (62, 70, 40, 26) operable from the surface during workover to actuate the valve (18) in the wellhead portion (10) open. This provides for greater safety during the workover phase in comparison to a wire set plug and allows safer re-entry to the well.
Description
The present invention relates to safety valves with subsea trees and particularly horizontal subsea trees.
The use of horizontal trees is rapidly becoming the norm for subsea completions because of the cost reduction offered over conventional technology. As subsea completions enter deep water the cost saving increases dramatically up to 25% as reported in an article entitled "Horizontal Trees Provide Quick Well Bore Access, 25% Cost Savings", edited by Leonard Le Blanc, Offshore International Magazine November 1993. Horizontal wellheads also allow for larger completions to be utilised in conventional technology, allowing a field to be exploited by fewer wells. However, the conventional method of isolating the horizontal wellhead after workover and before production, which may be a period of several years, is by situating wireline plugs in the tubing hanger. This is viewed by some major oil companies as a less than ideal method. One particular problem with this is that it is very difficult and indeed dangerous to extract the plugs prior to production. It has frequently been found that such plugs are often very difficult to remove which can add considerably to the cost of the exercise.
It is an object of the present invention to provide an improved apparatus and method for providing well isolation and to mitigate or obviate at least one of the disadvantages associated with the existing apparatus and methods.
This is achieved by using a two-part safety valve system. A first part containing a valve mechanism remains in the wellhead and is normally biased to a closed position. The valve remains in the wellhead at all times during production and can be actuated to an open position by latching in a second part which contains control cables and a moveable valve actuator operable from the surface during workover to actuate the valve in the wellhead portion open. This provides for greater safety during the workover phase in comparison to a wire set plug and also allows safer re-entry to the well.
According to one aspect of the invention, there is provided a horizontal tree safety valve system comprising,
a first safety valve portion disposed in said tree and having a valve element moveable between an open and a closed position,
a second safety valve portion releasably securable to said first valve portion and having a moveable valve element actuating means whereby when said first and second valve portions are secured together, said valve element actuating means is responsive to a control signal to actuate said valve element to move from a closed to an open position.
Accordingly in another aspect of the present invention there is provided a horizontal tree safety valve comprising:
a first safety valve portion containing moveable valve means located in the tree, first resiliently biased means located in said first valve portion and coupled to moveable valves means for urging said moveable valve means to a closed position,
a second safety valve portion adapted to be releasably secured to said first valve portion by latch means, said latch means having respective first and second latching portions coupled to said first and second valve portions,
said second valve portion having a resiliently biased element adapted to be coupled to said moveable valve means when said first and second safety valve portions are secured together, said resiliently biased element being responsive to an actuating force applied thereto to urge said moveable valve means to an open position when said actuating force is present, said first resiliently biased means and said resiliently biased element urging said valve means to a closed position in the absence of said actuating force.
Preferably said moveable valve means is an apertured ball valve, said apertured ball valve having a central through-hole when being moveable in response to an actuating force between the closed position and through 90° to the open position.
Conveniently, said first portion resiliently biased means is implemented by a coil spring.
The ball valve is located in a ball cage and the ball has a pair of slots machined in faces thereof for receiving pins about which the ball moves axially and rotatably. The slots are disposed at 45° to the axis of aperture through the ball.
Preferably the latch means is implemented by a plurality of pivotal fingers located at the bottom of said second portion and a circumferential latching profile disposed at the top of said first valve portion. Conveniently there are sixteen pivoting fingers.
The pivoting fingers are moveable radially so as to engage with the latching profile and the second valve portion includes means which are actuatable to lock said fingers in position after the first and second valve portions are engaged. Conveniently this is achieved by applying pressurised hydraulic fluid through a hydraulic port and a hydraulic line to said second valve portion which actuates a latch lock downwardly to ensure the latch fingers are secured to the latch profile thereby locking the first and second valve portions together. The latch lock can also be actuated upwardly to release the lock on the fingers to facilitate disengagement of the first and second valve portions.
Conveniently, the second valve portion contains a valve actuating member moveable between an out-of-use position whereby the valve remains closed and an in-use position whereby it engages valve carriers to locate the valve through 90° to an open position, said valve engagement means being coupled to a resiliently biased means to normally urge the engagement means out of engagement from the ball valve. A hydraulic line is coupled to the engagement means and when pressurised hydraulic fluid forces the engagement means against the resiliently biased means to overcome the resilient force and push against the ball valve seat to rotate the ball valve to an open position.
Conveniently, the latch spring and latch spring pusher are disposed concentrically about the engagement means and the resiliently biased means for engaging the ball valve.
According to another aspect of the present invention, there is provided a method of isolating a wellhead and allowing re-entry to the well comprising the steps of,
providing the horizontal tree with a first valve portion having moveable valve means therein,
providing a second valve portion separate from the first valve portion and providing said second valve portion with fluid control lines, engaging said first and second valve portions, and
actuating a moveable element in said second valve portion to move to engage said valve means in said first valve portion whereby said valve means is moved from a closed position to an open position in the presence of an actuating force, and said first and second portions containing resiliently biased means for closing the valve and for disengaging from the valve in the absence of said force.
These and other aspects of the invention will become apparent from the following description when taken in combination with the accompanying drawings in which:
FIG. 1 is a diagrammatic representation of a horizontal tree safety valve in accordance with an embodiment of the present invention showing the first and second valve portions separately;
FIG. 2 shows the portions of FIG. 1 when latched together with the valve closed, and
FIG. 3 is similar to FIG. 2 but shows the upper portion actuated to open the valve and the valve in an open position.
Reference is first made to FIG. 1 of the drawings which depicts a horizontal tree internal stack-up generally indicated by reference numeral 10 and a safety valve operator generally indicated by reference numeral 12. As will be later described in detail, it will be appreciated that the operator 12 may be removably engaged with the horizontal tree internal stack-up 10 whereby the safety valve contained in the horizontal tree can be opened and closed in accordance with hydraulic control signals from the surface.
To facilitate understanding, the horizontal tree internal stack-up 10 will be first described, then the safety valve operator 12 will be described, how they combine to latch as shown in FIG. 2 will be described and then how they combine to operate and actuate the valve open or closed will also be described.
The horizontal tree internal stack-up consists of an outer housing which has an internal locking profile 14 as shown by the broken line. It will be understood that the locking profile 14 is generally unique to a particular manufacturer and will vary from manufacturer to manufacturer depending on the type of horizontal tree. It will also be understood that the internal tree stack-up provided by the invention will be varied accordingly to fit in with the particular locking profiles of particular manufacturers.
The part indicated in hatch lines is generally known as the lower or first valve portion 16, although only one half of this is shown in the split section shown in FIG. 1. In the portion 16 an apertured ball valve 18 has flat faces 20, one of which is shown, into which a slot is machined (not shown in the interests of clarity) for receiving spigots 22 (only one of which is shown) which allow the valve to be moved axially as well as to rotate about its axis 24 between an open and closed position as will be described later in detail.
The ball element 18 contacts upper seat 26. The spigots 22 extend from a fixed ball operating mandrel 32 which define with the lower valve seat carrier 34 a chamber 36 in which are disposed coil springs 38 which urge the ball valve 18 against the upper seat 26. The upper ball valve seat 26 is contained within the latch ring generally indicated by reference numeral 40 which is coupled to the ball cage 30 as best seen in FIG. 1. This combination is sealed to a structural latch cap 42 which is, in turn, secured by a threaded fastening 43 to an outer lower valve housing 44.
Latch housing 40, ball cage 30, ball element 18 and lower valve seat carrier 34 are moveable axially relative to spigots 22 and operating mandrel 32 and, as will be described, as ball valve is moved down axially it simultaneously rotates from the closed position shown in FIG. 1 to the closed position shown in FIG. 3.
Reference is now made to the safety valve operator generally indicated by reference numeral 12. It will be seen from FIG. 1 that this is also a split section and this is a generally tubular element which has a top sub generally indicated by reference numeral 50 which is coupled to an outer cylindrical sleeve 52. Sub 50 contains hydraulic fluid conduits 56 which are adapted to be coupled to hydraulic fluid lines 58 for receiving hydraulic fluid to actuate the inner moveable sleeve as will be later described in detail.
Top sub housing 50 defines with inner moveable sleeve 62 annular cavities 64 and 65.
A latch retaining ring 68 is disposed at the bottom of annular stage 54 and carries 16 operating latch fingers 70, only one of which is shown. Latch fingers 70 are mounted at a pivot point 72 to the ring 68 and are pivotable between a first position (the latch position shown in solid outline) and a second position (the unlatched position) shown in broken outline. The top sub housing 50 engages with a latching piston 74 which defines with the intermediate ring 54 and sleeve 50 an outer annular cavity 76. The latching piston 74 is secured to a latch locking element 80 for locking the latch fingers 70 to the latching ring 90.
In the position shown in FIG. 1, which is the unengaged position, inner moveable sleeve 62 and ring 68 are in the upward position to allow the operating latch fingers 70 to pivot freely about pivot points 72 so as to facilitate engagement with the latch ring 40 of the internal tree to provide the engaged position as best seen in FIG. 2, as will be later described in detail.
Reference is now made to FIG. 2 of the drawings which depicts safety valve portions 10 and 12 shown in FIG. 2 in an engaged position. It will be seen in this engaged position that the latch fingers 70 all engage with the latch profile 40. It will be seen in this position that no hydraulic pressure has been applied to hydraulic lines and the ball valve 18 remains in a closed position. In order to secure the coupling of the portions 10 and 12 it is necessary to apply hydraulic pressure to lock the latch fingers 70 in position. This is achieved by applying pressure via hydraulic line 58 which forces the latching piston 74 and locking element 80 outward against the spring force. Once the operator is coupled to the horizontal tree as shown in FIG. 2 the ball valve 18 can then be actuated to an open position.
This is achieved by applying hydraulic pressure via conduit 56 which causes fluid pressure to be applied to the landing 85 at the top of the internal sleeve 62 at position 86 as shown and this forces the sleeve 62 downwardly. The sleeve 62, fingers 70, profile carrier 40 and upper ball valve seat 26 are forced down past valve cap 42 against the outer surface of the ball valve 18. This forces the ball valve element axially downwards and, as described in co-pending published International Patent Application No. PCT/GB93/01110, the ball is moved via the valve slots and spigots 22 in a 45° angle path which forces the ball valve to rotate from the position shown in FIG. 2 through 90° to the position shown in FIG. 3 whereby the ball valve aperture 19 is now oriented in the vertical position allowing access through the wellhead.
It will be appreciated that the ball valve is only open as long as hydraulic pressure is applied to the lines 84. At the end of operation from the wellhead tree, hydraulic pressure to the operator 12 is stopped; springs 38 firstly force the internal sleeve 62 upwardly with the result that pressure on the ball valve element 18 is relieved and the coil spring 38 urges the bottom valve element 34 to force the valve upwardly again along the 45° path to rotate the valve from the open position back to the closed position. Simultaneously, pressure through line 82 is discontinued and pressure applied via aperture 84 urges the latching piston 74 and locking element 80 upwardly so that the contact between the locking element 80 and the top of the latching profile 90 is discontinued which allows an upward pull on the operator to disengage the latch fingers 70 from the latch ring 40 so that the operator 12 can be withdrawn to the surface leaving the wellhead closed, thereby returning to the position in FIG. 1.
Various modifications to the embodiment are hereinbefore described without departing from the scope of the invention. Firstly, it will be understood that the ball valve element may be replaced by any other suitable valve, for example a flap valve or a roller valve which can be actuated to open and close following coupling of a separate valve part. The latching mechanism may be replaced by any other suitable mechanism such as J-slots and the operator could be actuated pneumatically or electrically rather than hydraulically.
The principal advantage of the present invention is that it avoids the need for well plugs in the tubing hanger and it allows the well to be isolated after workover and before production and to be operated as and when required by simply latching into the tree with an operator section. This facilitates safer re-entry to the well.
Claims (12)
1. A horizontal tree safety valve system comprising,
a first safety valve portion disposed in said tree and having a valve element moveable between an open and a closed position,
a second safety valve portion releasably securable to said first valve portion and having a moveable valve element actuating means whereby when said first and second valve portions are secured together, said valve element actuating means is responsive to a control signal to actuate said valve element to move from said closed to said open position.
2. A valve as claimed in claim 1 wherein said moveable valve means is an apertured ball valve, said apertured ball valve having a central through-hole and moveable in response to an actuating force between the closed position and through 90° to the open position.
3. A valve as claimed in claim 2 wherein the ball valve includes a ball cage and ball, said ball having a pair of slots machined in faces thereof for receiving pins about which the ball moves axially and rotatably within the ball cage.
4. A valve as claimed in claim 3 wherein the second valve portion contains a valve actuating member moveable between amount-of-use position whereby the valve remains closed and an in-use position whereby it engages valve carriers to rotate the valve through 90° to an open position, said valve engagement means being coupled to a second resiliently biased means to normally urge the engagement means out of engagement from the ball valve.
5. A valve as claimed in claim 4 further comprising a hydraulic line coupled to the engagement means to introduce pressurised hydraulic fluid such that said pressurised hydraulic fluid forces the engagement means against the second resiliently biased means to overcome the resilient force and push against a ball valve seat to rotate the ball valve to an open position.
6. A valve as claimed in claim 4 further comprising a latch spring and latch spring pusher disposed concentrically about the engagement means and the resiliently biased means for engaging the ball valve.
7. A horizontal tree safety valve comprising:
a first safety valve portion containing valve means moveable between an open and a closed position, wherein said moveable valve means is located in the tree, a first resiliently biased means located in said first valve portion and coupled to said moveable valve means, said first resiliently biased means urging said moveable valve means to the closed position,
a second safety valve portion releasably secured to said first valve portion by latch means, said latch means having first and second latching portions coupled to said respective first and second valve portions,
said second valve portion having a resiliently biased element coupled to said moveable valve means when said first and second safety valve portions are secured together, said resiliently biased element responding to an actuating force applied thereto to urge said moveable valve means to the open position when said actuating force is present, said first resiliently biased means and said resiliently biased element urging said valve means to the closed position in the absence of said actuating force.
8. A valve as claimed in claim 7 wherein said first resiliently biased means is a coil spring.
9. A valve as claimed in claim 7 wherein the latch means comprises a plurality of pivotal fingers located at a bottom of said second portion and a circumferential latching profile disposed at a top of said first valve portion.
10. A valve as claimed in claim 9 wherein the pivotal fingers are moveable radially so as to engage with the latching profile and the second valve portion includes means which are actuatable to lock said fingers in position after the first and second valve portions are engaged.
11. A valve as claimed in claim 10 wherein said actuatable means include a latch lock actuated by applying pressurized hydraulic fluid through a hydraulic port and a hydraulic line to said second valve portion which actuates said latch lock downwardly to ensure the latch fingers are secured to the latch profile thereby locking the first and second valve portions together.
12. A method of isolating a wellhead and allowing re-entry to the well comprising the steps of,
providing a horizontal tree with a first valve portion having moveable valve means therein,
providing a second valve portion separate from the first valve portion and providing said second valve portion with fluid control lines, engaging said first and second valve portions, and
actuating a moveable element in said second valve portion to move to engage said valve means in said first valve portion whereby said valve means is moved from a closed position to an open position in the presence of an actuating force, and said first and second portions containing resiliently biased means for closing the valve and for disengaging from the valve in the absence of said force.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9326062 | 1993-12-21 | ||
GB939326062A GB9326062D0 (en) | 1993-12-21 | 1993-12-21 | Horizontal tree safety valve |
PCT/GB1994/002787 WO1995017578A1 (en) | 1993-12-21 | 1994-12-21 | Horizontal tree safety valve |
Publications (1)
Publication Number | Publication Date |
---|---|
US5918676A true US5918676A (en) | 1999-07-06 |
Family
ID=10746941
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/663,268 Expired - Lifetime US5918676A (en) | 1993-12-21 | 1994-12-21 | Horizontal tree safety valve |
Country Status (13)
Country | Link |
---|---|
US (1) | US5918676A (en) |
EP (1) | EP0736129B1 (en) |
CN (1) | CN1057813C (en) |
AU (1) | AU688437B2 (en) |
BR (1) | BR9408374A (en) |
CA (1) | CA2179601C (en) |
DE (1) | DE69423051T2 (en) |
DK (1) | DK0736129T3 (en) |
ES (1) | ES2145256T3 (en) |
GB (1) | GB9326062D0 (en) |
GR (1) | GR3033413T3 (en) |
NO (1) | NO311699B1 (en) |
WO (1) | WO1995017578A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001073254A3 (en) * | 2000-03-24 | 2002-03-28 | Fmc Corp | Coupling means for controls bridge through a tubing head |
US20130291961A1 (en) * | 2010-02-15 | 2013-11-07 | Petroleum Technology Company As | Valve device |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9514510D0 (en) * | 1995-07-15 | 1995-09-13 | Expro North Sea Ltd | Lightweight intervention system |
GB9514526D0 (en) * | 1995-07-15 | 1995-09-13 | Expro North Sea Ltd | Lightweight intervention system for use with horizontal tree with internal ball valve |
NO338149B1 (en) * | 2008-02-11 | 2016-08-01 | Petroleum Technology Co As | Device for fluid injection |
NO342043B1 (en) * | 2015-12-08 | 2018-03-19 | Aker Solutions As | Workover Safety System |
CN106151666B (en) * | 2016-08-12 | 2018-08-17 | 哈尔滨工程大学 | A kind of low-power consumption holding of underwater gate valve actuator and fail safe shut-down mechanism |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4325409A (en) * | 1977-10-17 | 1982-04-20 | Baker International Corporation | Pilot valve for subsea test valve system for deep water |
US4372391A (en) * | 1980-10-07 | 1983-02-08 | Halliburton Company | Screw operated emergency relief and safety valve |
US4560004A (en) * | 1984-05-30 | 1985-12-24 | Halliburton Company | Drill pipe tester - pressure balanced |
US4569397A (en) * | 1982-07-06 | 1986-02-11 | Baker Oil Tools, Inc. | Ball valve actuating mechanism |
US4577692A (en) * | 1985-03-04 | 1986-03-25 | Hughes Tool Company | Pressure operated test valve |
US4703807A (en) * | 1982-11-05 | 1987-11-03 | Hydril Company | Rotatable ball valve apparatus and method |
US5575336A (en) * | 1994-02-10 | 1996-11-19 | Fmc Corporation | Safety valve for horizontal tree |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4436157A (en) * | 1979-08-06 | 1984-03-13 | Baker International Corporation | Latch mechanism for subsea test tree |
US4658904A (en) * | 1985-05-31 | 1987-04-21 | Schlumberger Technology Corporation | Subsea master valve for use in well testing |
GB8714661D0 (en) * | 1987-06-23 | 1987-07-29 | British Petroleum Co Plc | Catalysts |
GB9213371D0 (en) * | 1992-06-24 | 1992-08-05 | Exploration & Prod Serv | Improved pressure relief valve |
US8176892B2 (en) * | 2006-06-08 | 2012-05-15 | Reisser Heinz-Gustav A | Internal combustion engine |
-
1993
- 1993-12-21 GB GB939326062A patent/GB9326062D0/en active Pending
-
1994
- 1994-12-21 EP EP95903874A patent/EP0736129B1/en not_active Expired - Lifetime
- 1994-12-21 WO PCT/GB1994/002787 patent/WO1995017578A1/en active IP Right Grant
- 1994-12-21 BR BR9408374A patent/BR9408374A/en not_active IP Right Cessation
- 1994-12-21 US US08/663,268 patent/US5918676A/en not_active Expired - Lifetime
- 1994-12-21 DK DK95903874T patent/DK0736129T3/en active
- 1994-12-21 CN CN94194594A patent/CN1057813C/en not_active Expired - Fee Related
- 1994-12-21 DE DE69423051T patent/DE69423051T2/en not_active Expired - Fee Related
- 1994-12-21 CA CA002179601A patent/CA2179601C/en not_active Expired - Lifetime
- 1994-12-21 AU AU12777/95A patent/AU688437B2/en not_active Expired
- 1994-12-21 ES ES95903874T patent/ES2145256T3/en not_active Expired - Lifetime
-
1996
- 1996-06-20 NO NO19962615A patent/NO311699B1/en not_active IP Right Cessation
-
2000
- 2000-05-15 GR GR20000401103T patent/GR3033413T3/en not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4325409A (en) * | 1977-10-17 | 1982-04-20 | Baker International Corporation | Pilot valve for subsea test valve system for deep water |
US4372391A (en) * | 1980-10-07 | 1983-02-08 | Halliburton Company | Screw operated emergency relief and safety valve |
US4569397A (en) * | 1982-07-06 | 1986-02-11 | Baker Oil Tools, Inc. | Ball valve actuating mechanism |
US4703807A (en) * | 1982-11-05 | 1987-11-03 | Hydril Company | Rotatable ball valve apparatus and method |
US4560004A (en) * | 1984-05-30 | 1985-12-24 | Halliburton Company | Drill pipe tester - pressure balanced |
US4577692A (en) * | 1985-03-04 | 1986-03-25 | Hughes Tool Company | Pressure operated test valve |
US5575336A (en) * | 1994-02-10 | 1996-11-19 | Fmc Corporation | Safety valve for horizontal tree |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001073254A3 (en) * | 2000-03-24 | 2002-03-28 | Fmc Corp | Coupling means for controls bridge through a tubing head |
US6494266B2 (en) | 2000-03-24 | 2002-12-17 | Fmc Technologies, Inc. | Controls bridge for flow completion systems |
US20130291961A1 (en) * | 2010-02-15 | 2013-11-07 | Petroleum Technology Company As | Valve device |
US9500062B2 (en) * | 2010-02-15 | 2016-11-22 | Petroleum Technology Company As | Valve device of a wellhead Christmas tree assembly |
Also Published As
Publication number | Publication date |
---|---|
NO962615L (en) | 1996-06-20 |
EP0736129B1 (en) | 2000-02-16 |
AU688437B2 (en) | 1998-03-12 |
WO1995017578A1 (en) | 1995-06-29 |
CN1057813C (en) | 2000-10-25 |
DE69423051T2 (en) | 2000-10-26 |
NO311699B1 (en) | 2002-01-07 |
ES2145256T3 (en) | 2000-07-01 |
EP0736129A1 (en) | 1996-10-09 |
CA2179601A1 (en) | 1995-06-29 |
DE69423051D1 (en) | 2000-03-23 |
AU1277795A (en) | 1995-07-10 |
GB9326062D0 (en) | 1994-02-23 |
DK0736129T3 (en) | 2000-07-24 |
GR3033413T3 (en) | 2000-09-29 |
CA2179601C (en) | 2002-07-16 |
BR9408374A (en) | 1997-08-19 |
CN1138360A (en) | 1996-12-18 |
NO962615D0 (en) | 1996-06-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU728992C (en) | Christmas tree | |
US5992527A (en) | Wellhead assembly | |
EP1278936B1 (en) | Tubing hanger with annulus bore | |
US5090481A (en) | Fluid flow control apparatus, shifting tool and method for oil and gas wells | |
US6520263B2 (en) | Retaining apparatus for use in a wellhead assembly and method for using the same | |
US9845661B2 (en) | Exercising a well tool | |
US4432417A (en) | Control pressure actuated downhole hanger apparatus | |
US6142233A (en) | Tree running tool with actuator for latch | |
US4519633A (en) | Subsea well casing tieback connector | |
AU2001247785A1 (en) | Tubing hanger with annulus bore | |
AU2001247785A2 (en) | Tubing hanger with annulus bore | |
CA3003475C (en) | Hybrid two piece packoff assembly | |
EP2923033B1 (en) | Subsea xmas tree assembly and associated method | |
US6793019B2 (en) | Tapered ramp positive lock latch mechanism | |
CA2232034C (en) | Single bore riser system | |
US5918676A (en) | Horizontal tree safety valve | |
US5222560A (en) | Full bore internal tieback system and method | |
US5329999A (en) | Annular safety system | |
US6182762B1 (en) | Storm valve | |
WO2004022908A1 (en) | A completion having an annulus valve |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: EXPRO NORTH SEA LIMITED, UNITED KINGDOM Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:EDWARDS, JEFFREY CHARLES;REEL/FRAME:008316/0360 Effective date: 19960610 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FPAY | Fee payment |
Year of fee payment: 12 |